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Photoshop was developed as part of the SFX efforts for Star Wars:
Thomas was a programmer, while John was in charge of special effects for the first Star Wars film. Brown confirms: "Photoshop is here today because of that movie." Thomas developed software to add effects and painting tools to images at John's request.Link
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.